Best or technical term for the act of including a *purposeful gaff* in writing?

phrase-requests terminology

Solution 1:

How about 'contrived ignorance'.

'Contrived' - Ingeniously or artfully devised or planned (OED).

Related

Verb for gradual learning
Burden TO or ON some one/thing?
What semantic notions inverted the meaning of 'with' (from opposition to association)?
What is part of speech of "fifteen minutes" in "She is fifteen minutes late"?
quote/phrase for "more likely to use something if it is right there"
Xylophone-like, piano-like, and violin-like
Difference between accepter and acceptor
What's the meaning of "in any absolute sense"?
Why do Americans 'tell' you Good Morning?
Is there an English idiom/metaphor for "mind boggling", only more so?
Umbrella term for paging, sorting and filtering in software [closed]
Is there a term describing a fish's mouth action as it breathes? [duplicate]